Will you be having a veil?
A side tiara would work with a veil , or a fascinator if you're not having one. Or what about those cute little hairgrips with flowers, pearls or sparkles - they had some lovely ones in Accesorize.
My hair is REALLY short (as in buzzcut) I may be able to grow it a bit before the wedding (but I have OCD and pull it out - the only solution is to have it so short I can't get a grip on it). So I'll be having a feathery sparkly fascinator type thing that covers most of my hair.

Hitched Sixpence Co-ordinator 